Chapter 18 Vocab.

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Across
  1. 1. Rays that are used in the medical field to kill cancer cells and make pictures of the brain.
  2. 4. The process in which white light separates into colors.
  3. 8. A copy of an object formed by reflected (or refracted)waves of light.
  4. 10. Packets of electromagnetic energy.
  5. 11. Objects that give off their own light (like the sun).
  6. 12. In this process, a material absorbs light at one wavelength and then emits light at a longer wavelength.
  7. 13. An acronym for radio detection and ranging.
  8. 14. A region of space that exerts electric forces on charged particles.
  9. 16. This word describes a material that transmits light.
  10. 17. A solid material that can emit light by fluorescence.
  11. 19. The rate at which a wave's energy flows through a given unit of area.
  12. 21. The emission of electrons from a metal cause by light striking the metal.
  13. 22. A false or distorted image.
  14. 23. A region of space that produces magnetic forces.
  15. 24. Color-coded pictures that show variations in temperature.
  16. 25. Light in which waves have the same wavelength, and the crests and troughs are lined up, is ___________ light.
  17. 26. The light produced when an object gets hot enough to glow.
  18. 27. Light with waves that vibrate in only one plan is ______________ light.
  19. 28. This type of reflection occurs when parallel light waves strike a surface and reflect all in the same direction.
Down
  1. 2. In ________________ modulation, the amplitude of the wave is varied.
  2. 3. Rays that are used in medicine, industry, and transportation to make pictures of the inside of solid objects.
  3. 4. An apparent change in the frequency of a wave (18.2)
  4. 5. This word means that light is redirected as it passes through a medium.
  5. 6. In frequency modulation, the ____________ of the wave is varied.
  6. 7. This word describes a material that either absorbs or reflects all of the light that strikes it.
  7. 9. A device that generates a beam of coherent light.
  8. 14. Transverse waves consisting of changing electric fields and changing magnetic fields.
  9. 15. This word describes a material that scatters light.
  10. 18. An electromagnetic _______________ is the full range of frequencies of electromagnetic radiation.
  11. 20. Cyan is an example of a ___________ ___________, because it is a combo of two primary colors.
  12. 21. Three specific colors that can combine in varying amounts to create all possible colors.